You buy an ICE bike that is similar to the expected performance of the Empulse, just for the practice.
Yep, I've been without a bike for about a year, and I don't want to do anything dumb like drop it on my first day because I forgot how to ride. So I just bought a used Kawasaki Ninja 500R. I'm hoping that will give me some practice while I wait. (Curiously, getting back on a bike was a lot easier than I thought it would be. I guess it was just like riding a bike. Duh.
)
The bikes are about the same weight (430 lbs vs 420 lbs for the E 10) and we're expecting the Empulse to behave like a 600 cc sports bike.
I just hope that it will be easy to sell the Ninja when it's Empulse time.